The Six Sigma program was motivated by customer satisfactions, but the entitlement of the cost saving resulted from the improved process was actually the driving force that put th program in practice. The actual system shipment rate can be estimated from historical marketing data. Semiconductor testing equipment industry exhibits a cyclical pattern as it is driven by the volatile device market. To accommodate the market volatility, the monthly system shipments are modeled as a normal distribution with the mean of 32 systems per month and the standard deviation of 10 systems per month. Each system is configured with 20 PCB boards on average.